Insulator for radio antennae



March 12, 1929. B. E. COLBURN INSULATOR FOR mmomrmm Filed March 22, 1928Patented Mar. 12, 1929.

UNITED STATES p 1,705,174 PATENT OFFICE.

BEARL E. COLBURN, OF GREEN BAY, WISCONSIN, ASSIGNOR TO AERIAL INSULATOR(70., INQ, OF GREEN BAY, WISCONSIN, A CORPORl L'IION OF WISCONSIN.

INSULATCR FOR RADIOANTENNZE.

Application filed March 22, .1928. Serial No. 263,750.

This invention pertains to improvements in radio antennae, and moreparticularly to a head-piece for insulating and attaching the antennawires to any form of suitable support.

The invention has primarily for its object to provide a simple,inexpensive, and ellicient insulator head applicable to any type ofvertical or horizontal antenna, as for instance those commonly termedstraight-line,

cage, or umbrella types.

Incidental to the foregoing, a more specific object is to provide asimple and novel structure of insulator, wherein the attaching means isefliciently insulated from the antenna receiving member. r.

Another object is to provide an insulator of the foregoing character,with means capable of attachment to any and all types of supports, suchas a pole, hook, or tree.

A still further object resides in the provision of a novel insulatedantenna receiving member, which permits the construction of thealternative types hereinbefore enumerated.

In the installation of conventional types of radio antennae, supportedupon a mast or pole, it is common practise to provide guy wires, whichare necessarily conductors of a v high frequency radiation, for bracingthe supporting poles or masts. Due to the close proximity of these wiresto the antenna, it is.

necessary to provide and install a great number of insulating blocks atboth ends of the wire, in order to prevent grounding and consequentdetraction-from the efiiciency of the antenna by inductance.

It is therefore a further object of the. present invention to overcomethe foregoing ob- 'jections and provide. a single insulator forattachment to the pole or mast and adapted to receive any number of guywires, thus eliminating the necessity of installing individualinsulators betwemi the guy wires and pole.

\Vith the above and other objects in View, which will appear as thedescription proceeds, the invention resides in the novel construction,combination and arrangement "of parts substantially as hereinafterdescribed and more particularly defined by the appended claims, it beingunderstood that such changes in the precise embodiment of the hereindisclosed invention may be made as come withinthe scope of the claims,

In the accompanying drawings is illus trated one complete example of thephysical embodiment of the present invention constructed accordlngftothe best mode so far devised. for the practical application of theprinciples thereof.

Figurel is a transverse sectioncthrough an insulator constructed inaccordance with the present invention, the same being taken on line 11of Figure 2.

Figure 2 is an elevational view.

Figure 3 illustrates the present invention applied to what is commonlytermed a cage type of antenna, and

Figure 4 illustrates the invention applied to an umbrellatype antenna,or' a mast for receiving any other conventional type of horizontalantennae. i

Referring now more particularly to the accompanying drawings, thenumeral 1 designates an annular plate constructed of any suitableinsulating material, and provided centrally of its outer face with anannular recess 2 for the reception of the-head 3 of a threaded stud 4-.The peripheral edge of the plate 1 adjacent its outer face, is providedwith a shoulder 5, rearwardly of which is a second annular shoulder 6adapted to receive an inwardly projecting flange 7 of theantennareceiving ring 8, which ring is provided with a rearwardly proecting offset holes 10 for the reception of the antenna or guy wires. I

At spaced intervals the flange 7 of the ring 8 is provided with slots 11for the reception of screws 12 threaded into the insulating plate 1, theheads of the screws engaging the shoulder 5, of the insulating block,and flange 7, to retain the ring in tight engagement with the insulatedblock.

As best shown in Figure 1, the block 1 is provided with a recess13 onits rear face, for the reception of the nut 14 threaded on the stud 4 toclamp the same to the block 1. "The head 3 of the stud 4 is providedwith an car 15, having an opening 16, for the purpose to be hereinafterdescribed.

While the present invention has many ap-= plications, those which aremost characteristic have been illustrated. Figure 3 shows the insulatorutilized in a cage type antenna, wherein two insulators are employed,and the antenna wiresW are strung from one to the other. In this form,the insulators are fastened to any suitable support by means of theapron 9, provided with a plurality of spaced hooks H, received in theopenings 16 provided in the studs 15, although it will be obvious thatthe studs may be fastened to any support, such'as-a tree or mast, bymeans of Wires or cables.

In that application of the invention illus trated in Figure 4, which iscommonly termed an umbrella type of antenna, the stud L is antenna, inwhich instance the antenna would be connected to the ear l6, and thelead-in wire taken off of the antenna instead of the ring 8.

However, in both instances, the lower ends of the wires W are insulatedfrom the support by blocks I to prevent grounding.

From the foregoing description, it will be seen that a very simple,inexpensive and efficient insulator has been provided, which may bereadily applied toantennae of types. It will also be noted that theconstruction of the insulating block, wherein the head 3 of the stud 4is received in a recess and separated from they screws 12 and the flange6 by a projecting portion of the insulating block, serves to prevent thepassing of current from the antenna ring to the stud, or vice versa.This is also true of the rear face of the insulating plate, as the nut,14 isrecessed into the'plat-e, It will be appreciated that a sufficientamount of insulating material has been provided in i the plate 1 toproperly insulate the antenna ing a plate formed of insulating material,a

receiving member from the attaching stud.

I claim I 1-. An insulator for radio antennae compristhreaded studsecured centrally of'said plate for attachment to a suitable support, aring secured to the periphery of said plate and spaced from saidstud,and an off-setapron projecting from said ring and provided Withtioned in said opening, a head carriedby the stud and received in one ofsaid recesses, a nut other of said recesses, and a ring secured to theperiphery of said plate and provided with spaced Wire receivingapertures.

3. An insulator for radio antennae comprising an annular plate formed ofinsulating ma- 6 terial and provided with an annular shoulder,

a threaded stud secured centrally of said plate, a ring surrounding saidplate and provided with an inwardly projecting flange engaging saidshoulder, and means engaging 6 said flange for securing the same to saidplate, said ring being provided with spaced wire receiving apertu'resl4. An insulator for radio antennae comprising a plate formed ofinsulating material and provided'with a central opening and recesses onits opposite faces alined with saidopen-' ing, the periphery of saidplate-being provided with an annular shoulder, a threaded studpositioned in said central opening and 7 having a head received in oneof said apertures, an ear projecting from said head and provided with anaperture, a nut threaded on said stud and received in the other. of saidrecesses for securing said stud to the plate, a 3 ring surrounding theperiphery of said plate and provided with an inturned flange engagingsaid shoulder,'screws threaded into said plate and provided with headsengaging-said flange to lock the same against the peripheral 8 shoulderformedin said plate, and an offset apron projecting from said plate andprovided with spaced wire receiving apertures.

In testimony that I claim the foregoing I threaded on said stud andpositioned in the 5 have hereunto set my hand at Green Bay, in

the county of Brown and State of Wisconsin. BEARL E. COLBURN.

